how to edit post to beam on deck

[Elovia]

First comes the disclaimer that Pro will not perform any engineering (including sizing beams and columns); you will need a real live engineer (preferably one that is licensed in your area) to perform those calculations for you - unless you are one yourself.

Next, you should be able to specify the newel size (and spacing) in the Railing Specification dialog. Select the railing and open the Railing Specification dialog, then set the newel size on the Newels/Balusters tab.

However, if you're wanting to use something other than square (or round) posts, then you can reduce the size of the newel and then place a column or other millwork from the library over the top; this will take more work and attention to detail, but offers a more rewarding and flexible design.